As far as most forgiving head for me it is Slick Trick Viper Trick 100's. I shoot them on arrows with blazer style vanes and Flex Fletch 360 vanes, easy tuning and not my normal struggle to find that magic head and arrow combo.
Most all the heads mentioned like Shuttle-t's, QAD, Muzzy 4 blade etc are great as well and I've tried them all with good to great results. I just find tuning the Viper Trick has been easier and they have been great in the wind for me
All my arrows are as consistent as I can get them by doing these steps cutting, squaring both ends, weighing, bare shaft spine indexed into paper, fletching, numbering, spin testing and spine indexing again with a broadheads. I have no problem grouping out to 80+ yards with them and have done that with most heads but Viper Trick has been the easiest and now that's the only fixed head I'm using.